Research examining the influence of ultimate issues testimony on juries has found

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Research suggests that ultimate issue testimony can have some influence on jury decisions, but generally, it does not overly bias their decision-making. Ultimate issue testimony refers to testimony that offers an opinion on the guilt or innocence of the defendant, which is usually reserved for the jury to decide. While some jurisdictions prohibit this type of testimony, in those that do permit it, studies have found that it does not lead to incorrect decisions or longer deliberations. However, it is important to note that the influence of ultimate issue testimony may vary among different jurors and in different cases.

Research Examining the Influence of Ultimate Issues Testimony on Juries